<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <script
  src="https://code.jquery.com/jquery-3.6.1.js"
  integrity="sha256-3zlB5s2uwoUzrXK3BT7AX3FyvojsraNFxCc2vC/7pNI="
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    <title>Document</title>
</head>
<body>
    <button>快速</button>
     <button>快速</button>
     <button>快速</button>
    <button>快速</button>
    <button>快速</button>
    <button>快速</button>
    <script>
$(function(){ 
    // 1,yind
    $("button").click(function(){
            $(this).css("background","pink")
            $(this).siblings("button").css("background","")
        })})
       
    </script>
</body>
</html>